Tonada was founded by Professor Zhangchi, of Chongqing University of Techonology, who has returned from abroad in 2007. Tonada is a high technology oriented enterprise. Its main product lines are manufacturing and marketing of brushless condenser fans and evaporator blowers for bus HVAC (heating, ventilation and air conditioner), heat exchangers (types: oil cooling/ radiator), refrigeration equipment and etc. In addition, they can also be applied on fresh air heat exchangers, intelligence-based station energy saving ventilation system and fan-coil units. Tonada DC brushless motors and its intelligent controllers have also been used on high pressure airless spraying machines.